Hi,
Because of pain in my wrist, I start searching for something help and a friend of mine told me about powerballs(nsb). I'll be very thankful if someone who had use them to write what he thinks about it and the model that he is using. Can they be used for training wrists flexibility and endurance. And also is at all any effect of them or they are just another useless equipment that is based on commercials. Thanks in advance.
Best,
azero